NDLI: Carbon and nitrogen mass balance during flue gas treatment with Dunaliella salina cultures

Content Provider	Springer Nature Link
Author	Harter, Till Bossier, Peter Verreth, Johan Bodé, Samuel Ha, David Debeer, Ann Eline Boon, Nico Boeckx, Pascal Vyverman, Wim Nevejan, Nancy
Copyright Year	2012
Abstract	The biotreatment of flue gases with algae cultures is a promising option to sequestrate CO$_{2}$, yet the emission of other greenhouse gases (GHG) from the cultures can hamper their environmental benefit. Quantitative data on the sequestration potential for CO$_{2}$ and NO$_{ x }$ in relation to the direct production of CH$_{4}$ and N$_{2}$O are urgently required. The present study assessed the flows of carbon (C) and nitrogen (N) through cultures of the green alga Dunaliella salina, supplied with biodiesel flue gas, by means of mass balancing. D. salina was grown in artificially lighted, field- (42-L bubble column reactor) and laboratory-scale cultures (23 °C, pH 7.5). In the bubble column reactor, algae grew with an average specific growth rate of 0.237 day$^{−1}$ under flue gas supplementation (6.3 % (v/v) CO$_{2}$, 1.2 ppmv NO$_{ x }$), and CO$_{2}$ was retained to 39 % in the system. The specific sequestration rate for CO$_{2}$ was low, with 0.13 g CO$_{2}$ L$^{−1}$ day$^{−1}$. Cultures emitted up to 13.03 μg CH$_{4}$ L$^{−1}$ day$^{−1}$ and 4261 μg N$_{2}$O L$^{−1}$ day$^{−1}$. The moderate retention of NO$_{ x }$-N was outweighed by emissions of N$_{2}$O-N, and total N in the system decreased by 15.48 % during the 9-day trial. Results suggest that GHG production was mainly the outcome of anaerobic microbial processes and their emission was lower in pre-sterilized cultures. Under the tested conditions, up to six times more CO$_{2}$ equivalents were emitted during flue gas treatment. Therefore, the direct GHG emissions of algae culture systems, intended for flue gas treatment (i.e. open ponds) need to be reviewed critically.
Starting Page	359
Ending Page	368
Page Count	10
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	25
Issue Number	2
e-ISSN	15735176
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bioremediation Climate change Co-sequestration Life cycle assessment Microalgae Photobioreactor Plant Sciences Freshwater & Marine Ecology Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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